Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:20597a –
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السيوطي:٢٠٥٩٧a –

"مَنْ أُصِيبَ بمُصِيبَة في مَالِه أَوْ جَسَدِه فَكَتَمَهَا (*) وَلَمْ يَشْكُها إِلى النَّاسِ، كَانَ حَقًّا عَلَى الله - تعالى - أَنْ يَغْفِر لَهُ".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:11438 – Aḥmad b. ʿAlī al-Abbār > Hishām b. Khālid > Baqiyyah > Ibn Jurayj > ʿAṭāʾ > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Whoever is afflicted with calamity in his wealth or body and conceals it without complaining to the people, then it is a right upon Allah to forgive him."  

الطبراني:١١٤٣٨ – حَدَّثَنَا أَحْمَدُ بْنُ عَلِيٍّ الْأَبَّارُ ثنا هِشَامُ بْنُ خَالِدٍ ثنا بَقِيَّةُ عَنِ ابْنِ جُرَيْجٍ عَنْ عَطَاءٍ عَنِ ابْنِ عَبَّاسٍ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «مَنْ أُصِيبَ بِمُصِيبَةٍ فِي مَالِهِ أَوْ جَسَدِهِ فَكَتَمَها فَلَمْ يَشْكُها إِلَى النَّاسِ كَانَ حَقًّا عَلَى اللهِ أَنْ يَغْفِرَ لَهُ»